Buggy code:
public void infer ( Code . IndirectInvoke code , Block . Entry entry , ConstantPropagation . Env environment ) { } public void infer ( Code . IndirectSend code , Block . Entry entry , ConstantPropagation . Env environment ) { } public void infer ( Code . Invoke code , Block . Entry entry , ConstantPropagation . Env environment ) { } public void infer ( int index , Code . ListAppend code , Block . Entry entry , ConstantPropagation . Env environment ) { } public void infer ( int index , Code . ListLength code , Block . Entry entry , ConstantPropagation . Env environment ) { } public void infer ( int index , Code . SubList code , Block . Entry entry , ConstantPropagation . Env environment ) { } public void infer ( int index , Code . ListLoad code , Block . Entry entry , ConstantPropagation . Env environment ) { } public void infer ( int index , Code . Load code , Block . Entry entry , ConstantPropagation . Env environment ) { } public void infer ( Code . Update code , Block . Entry entry , ConstantPropagation . Env environment ) { } public void infer ( int index , Code . NewDict code , Block . Entry entry , ConstantPropagation . Env environment ) { } public void infer ( int index , Code . NewRecord code , Block . Entry entry , ConstantPropagation . Env environment ) { } public void infer ( int index , Code . NewList code , Block . Entry entry , ConstantPropagation . Env environment ) { } public void infer ( int index , Code . NewSet code , Block . Entry entry , ConstantPropagation . Env environment ) { } public void infer ( int index , Code . NewTuple code , Block . Entry entry , ConstantPropagation . Env environment ) { } public void infer ( Code . Return code , Block . Entry entry , ConstantPropagation . Env environment ) { } public void infer ( Code . Send code , Block . Entry entry , ConstantPropagation . Env environment ) { } public void infer ( Code . Store code , Block . Entry entry , ConstantPropagation . Env environment ) { } public void infer ( int index , Code . SetUnion code , Block . Entry entry , ConstantPropagation . Env environment ) { } public void infer ( int index , Code . SetIntersect code , Block . Entry entry , ConstantPropagation . Env environment ) { } public void infer ( int index , Code . SetDifference code , Block . Entry entry , ConstantPropagation . Env environment ) { } public void infer ( int index , Code . SetLength code , Block . Entry entry , ConstantPropagation . Env environment ) { } public void infer ( int index , Code . StringAppend code , Block . Entry entry , ConstantPropagation . Env environment ) { } public void infer ( int index , Code . StringLoad code , Block . Entry entry , ConstantPropagation . Env environment ) { } public void infer ( int index , Code . StringLength code , Block . Entry entry , ConstantPropagation . Env environment ) { } public void infer ( int index , Code . SubString code , Block . Entry entry , ConstantPropagation . Env environment ) { } public void infer ( int index , Code . Invert code , Block . Entry entry , ConstantPropagation . Env environment ) { } public void infer ( int index , Code . Negate code , Block . Entry entry , ConstantPropagation . Env environment ) { } public void infer ( int index , Code . Spawn code , Block . Entry entry , ConstantPropagation . Env environment ) { } public void infer ( int index , Code . Throw code , Block . Entry entry , ConstantPropagation . Env environment ) { } public void infer ( int index , Code . ProcLoad code , Block . Entry entry , ConstantPropagation . Env environment ) { } @ Override public Pair < ConstantPropagation . Env , ConstantPropagation . Env > propagate ( int index , Code . IfGoto igoto , Entry stmt , ConstantPropagation . Env environment ) { } @ Override public Pair < ConstantPropagation . Env , ConstantPropagation . Env > propagate ( int index , Code . IfType code , Entry stmt , ConstantPropagation . Env environment ) { } @ Override public List < ConstantPropagation . Env > propagate ( int index , Code . Switch sw , Entry stmt , ConstantPropagation . Env environment ) { } @ Override <START_BUG> public ConstantPropagation . Env propagate ( Code code , Type handler , ConstantPropagation . Env environment ) { <END_BUG> ConstantPropagation . Env catchEnvironment = ( ( ConstantPropagation . Env ) ( environment . clone ( ) ) ) ; catchEnvironment . push ( null ) ; return catchEnvironment ; } @ Override public ConstantPropagation . Env propagate ( int start , int end , Code . Loop loop , Entry stmt , ConstantPropagation . Env environment , List < Pair < Type , String > > handlers ) { } public ConstantPropagation . Env join ( ConstantPropagation . Env env1 , ConstantPropagation . Env env2 ) { } public static class Env extends ArrayList < Value > { public Env ( ) { } public Env ( Collection < Value > v ) { } public void push ( Value t ) { } public Value top ( ) { } public Value pop ( ) { } public ConstantPropagation . Env clone ( ) { } } private static class Rewrite { public final Entry rewrite ; public final int stackArgs ; public Rewrite ( Block . Entry rewrite , int stackArgs ) { } }

Fix:
public ConstantPropagation . Env propagate ( Type handler , ConstantPropagation . Env environment ) {